felixcheung commented on a change in pull request #24414: [SPARK-22044][SQL]
Add `cost` and `codegen` arguments to `explain`
URL: https://github.com/apache/spark/pull/24414#discussion_r277120867
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File path: R/pkg/R/DataFrame.R
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@@ -136,7 +136,15 @@ setMethod("schema",
#' Explain
#'
-#' Print the logical and physical Catalyst plans to the console for debugging.
+#' Print the Catalyst plans to the console for debugging.
+#'
+#' With no (or, all FALSE) options, this prints the physical
+#' plan. The options are mutually exclusive: at most one can be
+#' true.
+#'
+#' @param extended print the logical plans as well as the physical plans
+#' @param codegen print the generated code for whole-stage codegen
+#' @param cost print the optimized logical plan with operator costs
Review comment:
the doc is there, this might have broken R build
https://github.com/apache/spark/blob/beba93c562cc98f6ebe799830f55e54d7c69fa0d/R/pkg/R/generics.R#L467
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